{
  "cveId": "CVE-2023-45129",
  "url": "https://patchblox.com/security/cve/CVE-2023-45129",
  "summary": "CVE-2023-45129 is fixed in matrix-synapse on 1 platform by DEBIAN-CVE-2023-45129 (version 1.94.0-1), released October 10, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "matrix-synapse: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation",
  "description": "Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.",
  "published": "2023-10-10T18:15:19Z",
  "severity": "medium",
  "cvss": 4.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.01394,
  "epssPercentile": 0.72538,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "matrix-synapse",
      "release": "Debian 14",
      "fixedVersion": "1.94.0-1",
      "fix": "DEBIAN-CVE-2023-45129",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-45129",
      "released": "2023-10-10T18:15:19Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}